Insignia Description
A Silver color metal and enamel device 1 3/32 inches (2.78 cm) in height overall consisting of a shield blazoned: Per fess enhanced Tenné and Argent, in chief a diamond headed spear issuing from sinister fesswise of the second and in base on and over a pale Azure (bluebird) a fire beacon Proper. Attached below the shield is an Orange scroll inscribed "LEOKANI OKAUWILA" (Voice of Lightning) in Silver letters.

Symbolism
Orange and white are the colors used for the Signal Corps. The blue is that of the Korean Service Ribbon. The spear, with its diamond head represents defense of Oahu on 7 December 1941, and the role of the 25th Division in spearheading the war in the Pacific. The fire signal against the three divisions of the bottom of the shield symbolizes the achievement of the unit in maintaining signal communications against three North Korean divisions in the Masan-Chinju operation in 1950.

History
The distinctive unit insignia was approved on 31 January 1958.

Source: The US Army Institute of Heraldry